JP2012081543A - Machine tool, and processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool capable of using a workpiece rotating tool even after quenching of the workpiece, and automating processing without damaging the workpiece nor limiting the shape of the workpiece.SOLUTION: This machine tool includes a workpiece rotating tool 1 for transmitting rotation of a main shaft 21 to the workpiece 30 supported by the main shaft 21 and a tailstock spindle. The tool 1 includes a tool body 2, a plurality of frictional contact members 3, and a plurality of contact member energization member 4. The tool body 2 is coaxially and detachably mounted to a tip of the main shaft 21, and includes, at the center of a tip surface, a center piece 5 engaging with a center hole 31 formed on an end face of the workpiece 30. The frictional contact members 3 are arranged around the axis of the tool body 2, and bidirectionally movable in the axial direction to be capable of abutting on the end face of the workpiece 30. The respective frictional contact members 3 are energized by the individually-arranged contact member energization member 4.

Description

  The present invention relates to a machine tool such as a cylindrical grinder or a lathe, and a machining method.

  There is a center work as a processing method of a workpiece. In this center work, the workpiece is supported by center holes at both ends thereof, and the rotation of the main shaft is transmitted to the workpiece via the rotation transmission means. One way to do this is to attach a scraper (worker) to the workpiece, or drill holes in one end of the workpiece, and connect the turning plate attached to the spindle end to the workpiece hole or scrape with a round bar. The workpiece is rotated.

  As another conventional example, there is known a face driver in which a strong spring is provided inside a jig body attached to a spindle end, and a sharp claw part attached to a center is caused to bite into an end face of a workpiece by the spring. (For example, Patent Documents 1 to 3). The center member is movable forward and backward in the axial direction with respect to the jig body, and is biased to protrude by a spring. As another conventional example, a workpiece rotation treatment in which a plurality of pins protruded by a spring from a fixed center attached to the spindle end is hooked into a recess on the end surface of the workpiece or a recess on the outer periphery to transmit rotation. A tool is known (for example, Patent Document 4).

JP 59-14410 A JP 60-123205 A JP-A-4-63610 JP-A-8-52608

The above-described conventional method of attaching the kerf to the work piece is not suitable for automating the machining work because it is necessary to provide a boss for attaching the kerf to the work piece or to attach it manually.
When using a face driver to bite the claw into the end face of the workpiece, it can only be applied to the workpiece before quenching. There is also a problem that the workpiece is damaged.
When the pin is hooked on the end face of the workpiece or on the outer periphery of the workpiece, the shape of the workpiece is specified as a shape that can be hooked by the pin.

  If the center member of the face driver is urged in the axial direction by a spring, machining is possible even if the center hole of the workpiece does not correspond to the center of rotation due to clearance or wear of the center member. . For this reason, even if the same center hole is used in the next process, there is a problem that the outer diameter of the workpiece is shaken, and the center hole as a common reference for each process becomes meaningless.

The object of the present invention is that it can be used regardless of the hardness of the workpiece, does not damage the workpiece, does not specify the shape of the workpiece, is highly versatile, and is discarded in the workpiece. The object is to provide a machine tool and a machining method that can automate machining without requiring bosses, burrs and the like.
Another object of the present invention is to maintain high machining accuracy even when used for multi-step machining in which the center hole of the workpiece is a reference.

A first machine tool according to the present invention includes a main shaft and a core pressing shaft that support a workpiece between each other, a workpiece rotation jig that transmits the rotation of the main shaft to the workpiece, and the main shaft and the core pressing shaft. In a machine tool provided with processing means for processing a supported workpiece,
A jig body on which the workpiece rotating jig is removably attached coaxially to the tip of the spindle, and a center piece that is attached to the jig body and engages with a center hole formed on one end surface of the workpiece. And a plurality of frictional contact members arranged around the axis of the jig body, each of which is supported so as to be movable back and forth in the axial direction, and whose tip surface is a flat contact surface that comes into contact with the end surface of the workpiece, A plurality of contact member urging means are provided in the jig body individually for each of the friction contact members, and urge each friction contact member toward the distal end side.

  According to this configuration, the friction contact member of the workpiece rotating jig is pressed against the end surface of the workpiece, and the rotation of the spindle is transmitted to the workpiece by friction force. Even if the workpiece is after quenching, it can be used and the end face of the workpiece is not damaged. Rotation is transmitted by frictional force, but contact member urging means is provided for each friction contact member provided separately, so that each friction contact member is urged in conjunction with each friction contact member. By absorbing the difference in the contact condition, the end face of the workpiece can be brought into contact without causing a slip, and the rotation of the workpiece can be caused. This also prevents the end face of the workpiece from being damaged. Because the frictional contact member is pressed against the end face of the work piece and rotated, it can be applied without specifying the shape as long as the work piece has an end face. High nature. In addition, it is not necessary to throw away bosses or burrs on the workpiece, making it possible to automate machining.

  In the present invention, the contact member biasing means may be a spring, a pneumatic cylinder, or a hydraulic cylinder. If it is a spring, a drive source is unnecessary and a structure becomes simple. In the case of a pneumatic cylinder or a hydraulic cylinder, the contact member biasing means can be retracted when engaging with the center hole of the workpiece, and the workability of attaching and detaching the workpiece is good. Moreover, when it is a spring or a pneumatic cylinder, it can press elastically and can absorb the difference of pressing force between several friction contact members, and can support a workpiece in good balance.

  The center piece may be fixed to the jig body. If the center piece can be moved back and forth with respect to the jig body, it can be machined even if the center hole of the workpiece does not correspond to the center of rotation due to the clearance or wear of the center piece. For this reason, even if the same center hole is used in the next process, the outer diameter of the workpiece may be shaken, and the center hole as a common reference for each process may not make sense. On the other hand, if the center piece is a so-called projecting center provided in a fixed state on the jig body, if the center hole of the workpiece does not correspond to the center of rotation, the support will be incomplete and processing may be possible. Can not. Therefore, it is possible to prevent unexpected machining without being coincident with the center of rotation, and even with multiple processes, high-precision machining can be performed with the center hole as a reference.

A second machine tool of the present invention includes a main shaft and a core pressing shaft that support workpieces between each other, a workpiece rotating jig that transmits rotation between the core pressing shaft and the workpiece, and the main shaft. And a processing tool for processing the workpiece supported by the core pushing shaft,
The workpiece rotating jig engages with a jig body that is detachably attached coaxially to the tip of the core pushing shaft, and a center hole that is attached to the jig body and formed on one end surface of the workpiece. A center piece and a plurality of friction contact members arranged around the axis of the jig main body, each of which is supported so as to be movable back and forth in the axial direction, and whose tip surface is a flat contact surface that abuts the end surface of the workpiece. And a plurality of contact member urging means that are individually provided in the jig main body with respect to each of the friction contact members and urge each friction contact member toward the distal end side.
The machine tool of this configuration is the same as the first machine tool of the present invention except that the workpiece rotating jig is attached to the core pushing shaft, and the first machine tool has been described above. Similar actions and effects can be obtained.

According to a third machine tool of the present invention, in the first machine tool, a workpiece rotating jig in the second machine tool is provided. That is, the third machine tool is provided with a workpiece rotation jig for transmitting rotation between the core pushing shaft and the workpiece in the first machine tool,
A workpiece rotating jig that transmits rotation between the core pushing shaft and the workpiece is attached to the tip of the core pushing shaft so as to be detachable in a coaxial manner, and a workpiece rotating jig attached to the jig main body. A center piece that fits into a center hole formed on one end surface of the workpiece, and is arranged around the axis of the jig body, and is supported so as to be able to advance and retreat in the axial direction, with the tip surface contacting the end surface of the workpiece. A plurality of friction contact members that are flat contact surfaces in contact with each other, and a plurality of contact members that are individually provided in the jig main body with respect to each of the friction contact members and bias each friction contact member toward the tip side. Biasing means.
By attaching the workpiece rotation jig having the above-described configuration to the main shaft and the core pushing shaft and supporting both ends of the workpiece, rotation transmission by frictional contact can be performed more reliably.

In any one of the first to third machine tools of the present invention, the machining means may include a tool for performing outer diameter grinding of a workpiece.
According to the machine tool having this configuration, the advantage of the workpiece rotating jig having the above-described configuration is effectively exhibited, and the workpiece can be supported without being damaged, and the outer diameter grinding can be performed with high accuracy.

In any one of the first to third machine tools of the present invention, the machining means may include a tool for performing outer diameter grinding of a workpiece.
According to the machine tool having this configuration, the advantage of the workpiece rotating jig having the above-described configuration is effectively exhibited, and the workpiece can be supported without being damaged, and the outer diameter turning can be performed with high accuracy.

The first machining method of the present invention is a method for grinding an outer diameter of a workpiece using the first machine tool of the present invention.
According to this method, the advantage of the workpiece rotating jig of the present invention is effectively exhibited, and the workpiece can be supported without being damaged and the outer diameter grinding can be performed with high accuracy.

  In this processing method, the workpiece may be a roller of a rolling bearing. Since the rollers of the rolling bearings need to be precisely grounded on the outer diameter and are mass-produced in large numbers, the outer diameter grinding processing method of the present invention is more effectively exhibited.

The second machining method of the present invention is a method for performing outer diameter turning of a workpiece using the machine tool of the present invention.
According to this method, the advantage of the workpiece rotating jig of the present invention is effectively exhibited, and the workpiece can be supported without being damaged, and the outer diameter turning can be performed with high accuracy.

A third machining method of the present invention is a rolling bearing component machining method, in which a rolling bearing component is supported by a main shaft and a core pushing shaft of a machine tool, and a center hole is formed in one end face of the rolling bearing component. The center piece is fitted, the rotation of the main shaft is transmitted to the rolling bearing part through the center piece, and a plurality of friction contact members are arranged around the axis of the center hole. It is characterized by biasing the rolling bearing parts.
According to this processing method, the rotation of the main shaft is transmitted to the rolling bearing part via the center piece, and a plurality of friction contact members are arranged around the center of the center hole, and the friction contact member is turned to the rolling bearing part. Therefore, it is possible to process with high accuracy without damaging the rolling bearing parts as a workpiece.

  A first machine tool according to the present invention includes a main shaft and a core pressing shaft that support workpieces between each other, a workpiece rotating jig that transmits rotation between the main shaft and the workpiece, and the main shaft and the core. In a machine tool comprising processing means for processing a workpiece supported by a push shaft, the work rotation jig is attached to a work piece supported by the main shaft and a core push shaft of the machine tool. A workpiece rotation jig for a machine tool for transmitting rotation, wherein the jig main body is removably attached coaxially to the tip of the main shaft, and is formed on one end surface of the work piece attached to the jig main body. A center piece that engages with the center hole, and a flat contact surface that is disposed around the axis of the jig main body and that is supported so as to be capable of moving forward and backward in the axial direction, and whose tip surface is in contact with the end surface of the workpiece. A plurality of friction contact members, and each of the friction contact members individually Provided with a plurality of contact member urging means for urging each friction contact member toward the tip side, provided within the body, can be used regardless of the hardness of the workpiece, and damage the workpiece In addition, there is no specification of the shape of the workpiece, and the versatility is high. In addition, the workpiece does not need to be thrown away and bosses and knurls are not required, so that machining can be automated.

  A second machine tool of the present invention includes a main shaft and a core pressing shaft that support workpieces between each other, a workpiece rotating jig that transmits rotation between the core pressing shaft and the workpiece, and the main shaft. And a machining means for machining a workpiece supported by a core pushing shaft, wherein the workpiece rotating jig is removably attached coaxially to the tip of the core pushing shaft. A center piece that is attached to the jig body and fits into a center hole formed on one end surface of the workpiece, and is arranged around the axis of the jig body and is supported so as to be movable forward and backward in the axial direction. A plurality of friction contact members whose front end surfaces are planar contact surfaces that abut against the end surface of the workpiece, and the friction contact members are individually provided in the jig body with respect to each of the friction contact members. A plurality of contact member urging means for urging the distal end side. It can be used without being influenced by the workpiece, it does not damage the workpiece, and there is no specification of the shape of the workpiece, so it is highly versatile. Automation is possible.

  In the third machine tool of the present invention, since the workpiece rotating jig is attached to both the main shaft and the core pushing shaft, both ends of the workpiece can be supported by the workpiece rotating jig, Rotational transmission by contact can be performed more reliably.

Since the first machining method of the present invention is a method of grinding an outer diameter of a workpiece using the first machine tool of the present invention, the advantages of the workpiece rotating jig of the present invention are effectively exhibited. Thus, the workpiece can be supported without being damaged and the outer diameter grinding can be performed with high accuracy.
Since the second machining method of the present invention is a method for grinding an outer diameter of a workpiece using the second machine tool of the present invention, the advantage of the workpiece rotating jig of the present invention is exhibited effectively. Thus, the workpiece can be supported without being damaged, and the outer diameter turning can be performed with high accuracy.

  A third processing method of the present invention is a processing method for processing a rolling bearing part by supporting the rolling bearing part with a main shaft and a core pushing shaft of a machine tool, and forming a center hole in one end face of the rolling bearing part. At the same time, the center piece is fitted, the rotation of the main shaft is transmitted to the rolling bearing part through the center piece, and a plurality of friction contact members are arranged around the axis of the center hole, and the friction contact is made. Since the member is urged to the rolling bearing part, the rolling bearing part can be supported and processed without any damage. The rolling bearing component is, for example, a rolling element of a rolling bearing or a bearing ring.

It is sectional drawing which fractures | ruptures and shows a part of workpiece rotating jig in the machine tool which concerns on one Embodiment of this invention. It is a front view of the workpiece rotating jig. It is explanatory drawing which shows the workpiece support state of the machine tool using the workpiece rotating jig. It is a top view which shows the workpiece support state of the machine tool of the embodiment. It is sectional drawing which fractures | ruptures and shows a part of workpiece rotating jig in the machine tool which concerns on other embodiment of this invention. It is a front view of the workpiece rotating jig. It is sectional drawing of the self-aligning roller bearing provided with the rolling bearing components used as an example of a workpiece.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, the machine tool 20 is of a type in which a workpiece 30 is rotationally driven by both center supports having a main shaft 21 and a core pressing shaft 22 and is processed by a processing means 51 having a grindstone 26. The workpiece rotating jig 1 is attached to the tip of the main shaft 21 to transmit the rotation of the main shaft 21. In the machine tool 20 of this embodiment, the workpiece rotating jig 1A is also attached to the tip of the core pressing shaft 22, and the workpiece 30 is supported between both the workpiece rotating jigs 1 and 1A. The workpiece rotating jig 1 on the spindle side and the workpiece rotating jig 1A on the core pushing shaft side have the same configuration. For example, two workpiece rotating jigs having exactly the same configuration are prepared, One piece may be used as the workpiece rotating jig 1 on the spindle side, and the remaining one may be used as the workpiece rotating jig 1A on the core pressing shaft side. A workpiece rotating jig set A is constituted by both workpiece rotating jigs 1 and 1A.

  The machine tool 20 may be of a double center support type having a main shaft 21 and a core pressing shaft 22, and may be a cylindrical grinder or a lathe. It is a cylindrical grinder that performs 30 outer diameter grinding. The machine tool 20 is provided with a headstock 41 and a tailstock 42 on a bed 40, and the spindle 21 is rotatably supported by the spindle stock 41 and is driven to rotate by a spindle motor (not shown). The core push shaft 22 is concentrically positioned with the main shaft 21 and is supported by the core push stand 42 so as to be rotatable and movable back and forth, and is advanced and retracted by a forward / backward drive source (not shown) such as a hydraulic cylinder built in the core push stand 42. It is done. The grindstone 26 serving as a tool is a rotary grindstone, and is mounted on a tool bed 43 serving as a grindstone table so as to be rotatable about an axis O2 parallel to the spindle axis O1 and mounted on the tool bed 43 ( (Not shown). The tool base 43 is movable forward and backward in a direction (X-axis direction) perpendicular to the main spindle axis O1 on a feed base 44 installed on the bed 40 so as to be movable forward and backward along the main spindle axis O1 (Z-axis direction). The grindstone 26 can be moved back and forth in two orthogonal axes by moving the feed table 44 forward and backward and the tool table 43 moving forward and backward. The feed table 44 and the tool table 43 are driven forward and backward by a servo motor (not shown). The grinding means 26, the tool table 43, and the feed table 44 constitute the processing means 51.

  The workpiece 30 is a shaft-like member having center holes 31 and 32 formed on both end faces, and is a roller of a rolling bearing such as a cylindrical roller bearing or a tapered roller bearing. FIG. 4 shows an example in which the workpiece 30 is a tapered roller, and FIG. 3 shows a case in which the workpiece 30 is a spherical roller. The self-aligning roller bearing using the spherical roller will be described later with reference to FIG. In the case of a cylindrical grinder, the grindstone 26 is used according to the shape of the outer peripheral surface of the workpiece 30. The workpiece 30 may be a cylindrical roller or another rolling bearing part.

  As shown in FIG. 1, the workpiece rotating jig 1 on the spindle side is attached to the tip of the spindle 21 so as to be detachable coaxially, and the center of the workpiece 30 attached to the jig body 2. A center piece 5 that engages with the hole 31, a plurality of friction contact members 3 arranged at equal intervals around the axis of the jig body 1, and each of these friction contacts as shown in FIG. A plurality of contact member urging means 4 are provided in the jig main body 2 individually for the member 3 and urge each friction contact member 3 toward the tip side. 1 shows a cross-sectional view taken along the line II in FIG.

  The jig body 2 is formed by assembling a jig body main part 2a and a member to be described later. The jig body main part 2a has a tapered shaft-shaped shank 6 extending rearward at the center of the rear end surface of the columnar main portion 2aa, and a fitting hole 23 provided at the center of the tip of the main shaft 21 (FIG. 3). And is detachably attached to the main shaft 21 by fitting with the shank 6. A male screw portion 2b is formed on the outer periphery of the rear end of the main portion 2aa of the jig body main component 2a, and a nut 13 that contacts the tip end surface of the main shaft 21 and removes the jig main body from the main shaft 21 is screwed. By turning the nut 13, the jig body 2 can be extracted from the main shaft 21.

  A central shaft portion 2ab having a round shaft shape is formed at the center of the front surface of the main portion 2aa of the jig main part 2a, and the center piece 5 is fixedly attached to the front end surface of the central shaft portion 2ab by welding or the like. Thus, a so-called protruding center is formed. The center piece 5 has a conical shape whose tip portion forms an angle of 60 °, and in order to prevent wear, the center piece 5 is made of a material hard with respect to the jig body 2, for example, a hardened steel material or a metal material harder than the steel material. Etc. are formed.

  The jig body 2 includes a thick cylindrical annular body 7 and an annular lid body 8 which are fitted to the central shaft portion 2a of the jig body main part 2a with respective inner diameter holes. The jig body 2 is constituted by the jig body main part 2a, the annular body 7 and the annular lid body 8. In the annular body 7, a plurality of circular accommodation holes 9 penetrating in the axial direction corresponding to each friction contact member 3 are formed so as to be equally distributed around the central shaft portion 2 a. The annular lid 8 is a lid member that closes the distal end side of the accommodation hole 9 of the annular body 7, and is fastened and fixed to the jig body 2 together with the annular body 7 by a plurality of bolts 10. The annular lid body 8 is provided with a plurality of friction contact member guide holes 11 that penetrate in the axial direction and communicate with the receiving holes 9 of the annular body 7.

  The frictional contact member 3 is a stepped columnar member, and is inserted into each frictional contact member guide hole 11 of the annular lid 8 in the jig main body 2 at the small-diameter shaft portion thereof. It is said that it can move freely. The contact surface 3a that is in contact with the end surface of the workpiece 30, which is the front end surface of the friction contact member 3, is a flat surface. At the rear end of each friction contact member 3 located in the receiving hole 9, a stopper / spring receiver 12 is provided that spreads on the outer periphery of the friction contact member 3.

  Here, the contact member urging means 4 is composed of a compression coil spring accommodated in the accommodation hole 9 of the annular body 8 and is interposed between the bottom surface of the accommodation hole 9 and the spring receiver 12. The friction contact member 3 is urged toward the protruding side by the urging force of the contact member urging means 4, that is, the elastic restoring force of the compression coil spring, and the spring receiver 12 comes into contact with the bottom surface on the lid side of the accommodation hole 9 to maximize the friction contact member 3. The protruding position is restricted. Instead of using a coil spring as the contact member biasing means 4, a pneumatic cylinder or a hydraulic cylinder may be installed in the accommodation hole 9.

  In FIG. 4, the workpiece rotating jig 1A on the core pushing shaft side has the same configuration as the workpiece rotating jig 1 on the main shaft side as described above, and thus the description thereof is omitted. The workpiece rotating jig 1A on the core pushing shaft side may be different from the workpiece rotating jig 1 on the spindle side in the radial direction and axial direction of each part, and is attached to the core pushing shaft 22. May be different in configuration.

  According to the machine tool 20 configured as described above, the workpiece 30 is supported and processed as follows. That is, as shown in FIG. 4, the workpiece rotating jigs 1 and 1A are attached to the main shaft 31 and the core pressing shaft 22, respectively. The workpiece 30 is arranged so that the center holes 31 and 32 on both ends thereof correspond to the center pieces 5 of the workpiece rotating jigs 1 and 1A on both sides, and a core pushing shaft is provided by a hydraulic cylinder or the like built in the core pushing stand 42. 22 is moved forward and clamped between the main shaft 31 and the core pressing shaft 22 in a sandwiched state via the workpiece rotating jigs 1 and 1A. The workpiece clamping force of the core pushing shaft 22 at this time is, for example, about 350 kg, and the sum of the spring forces of the springs serving as the friction member urging means 4 of both workpiece rotating jigs 1 and 1A is the core pushing shaft. It is arbitrarily determined and used within the range of 20 to 80% of the 22 workpiece clamping force.

By using the workpiece rotating jigs 1 and 1A as described above, the outer diameter of the workpiece 30 is not shaken with respect to the center axis, and the machining accuracy is not a problem as a machining reference in the next process. This has been confirmed as a result of trial manufacture and mounting of the workpiece rotation jigs 1 and 1A of the same embodiment on the machine tool 20 and actual processing.
According to the workpiece rotating jig 1 on the spindle side having the above-described configuration, the friction contact member 3 is pressed against the end surface of the workpiece 30, and the rotation of the spindle 21 is transmitted to the workpiece 30 by friction force. Unlike what makes the nail bite, the workpiece 30 can be used even after being quenched, and the end face of the workpiece 30 is not damaged. Rotation is transmitted by frictional force. However, since the contact member urging means 4 provided independently for each of the plurality of friction contact members 30 provided is different from the case of urging each friction contact member in conjunction with each other, The friction contact member 3 can absorb the difference in the contact condition, and can be brought into contact with the end face of the work piece 30 without slipping, thereby causing the work piece 30 to rotate. This also prevents the end face of the workpiece from being damaged.
Further, since the friction contact member 3 is pressed against the end face of the work piece 30 and rotated, the shape of the work piece 30 having an end face is different from that engaged with a concave portion or the like of the conventional work piece. It can be applied without limitation and is highly versatile. In addition, since the workpiece 30 does not require a thrown boss or scrape and can be handled in the same manner as a normal center, it can be easily attached and detached, and processing can be automated.

The workpiece rotation jig 1 </ b> A on the core pressing shaft side transmits the rotation of the workpiece 30 to the core pressing shaft 22, and rotates the core pressing shaft 22 in synchronization with the workpiece 30. Therefore, relative rotation does not occur between the centerpiece 5 on the side of the core pressing shaft and the center holes 31 and 32 of the workpiece 30, and wear is prevented. Further, since the rotation is transmitted by the friction of the friction contact member 3, the end surface of the workpiece 30 is prevented from being damaged by the workpiece rotating jig 1A on the core pressing shaft side.
Although the dead center is stopped and becomes a resistance, the live center in which the core pushing shaft 22 is rotated as in this embodiment has a very large driving force loss even if a slight resistance occurs. Very few.

In the above-described embodiment, the core pressing shaft 22 is rotatable so as to be rotated with the workpiece 30. However, a driving source (not shown) such as a motor is connected to the core pressing shaft 22 to thereby rotate the core pressing shaft. The workpiece 22 may be rotated in synchronization with the main shaft 21 to rotate the workpiece 30 from both ends. In that case, rotation of the core pressing shaft 22 is given to the workpiece 30 via the friction contact member 3 of the workpiece rotating jig 1A on the core pressing shaft 22 side.
In the above-described embodiment, the workpiece rotation jigs 1 and 1A are attached to both the main shaft 21 and the core pressing shaft 22, respectively. However, the workpiece rotation is performed on either the main shaft 21 or the core pressing shaft 22. The jigs 1 and 1A may be attached.

  5 and 6 show another embodiment of a workpiece rotating jig of a machine tool. In the workpiece rotating jig 1, in the embodiment shown in FIGS. 1 to 4, the tip 3 a of the friction contact member 3 has an L-shaped cross section, and the vertical piece 3 aa protruding from the tip is close to the center piece 5. It is biased to the inner diameter side. Further, the annular lid 8 has an outer diameter side lid portion 8A and an inner diameter so that the friction contact member 3 is inserted into the friction contact member guide hole 11 of the annular lid 8 without being obstructed by the shape of the tip portion 3a. Each of the frictional contact member guide holes 11 is formed by combining the lid portions 8A and 8B. The outer diameter side lid portion 8A is a guide hole 11, and the frictional contact member 3a becomes rotatable. The direction is determined by the notch of the inner diameter side cover portion 8B so that the frictional contact member 3a can contact at a fixed position without rotating. The outer diameter side two parts (8) A are fastened and fixed to the jig body 2 together with the annular body 7 by a plurality of bolts 10 as in the case of the annular lid body 8 in the embodiment of FIGS. The inner diameter side lid portion 8B is fastened and fixed to the tip of the annular body 7 by another plurality of bolts 27. Other configurations are substantially the same as those of the embodiment shown in FIGS. 1 to 4, and the description thereof is omitted here.

  Thus, in the workpiece rotating jig 1 of this embodiment, the tip end portion 3a of the friction contact member 3 has an L-shaped cross section, and the vertical piece portion 3aa protruding toward the tip end side is close to the center piece 5 on the inner diameter side. Therefore, even if the workpiece 30 has a small diameter, each friction contact member 3 can be reliably pressed against one end face thereof.

In each of the above-described embodiments, an example has been described in which the outer diameter grinding of the workpiece 30 is performed by the machine tool 20 including the cylindrical grinder using the workpiece rotating jig 1 and the workpiece rotating jig set A. The machine tool 20 is not limited to the cylindrical grinding machine, and may be a process other than the outer diameter grinding, for example, a lathe for performing an outer diameter turning. In that case, high machining accuracy can be obtained, and the same as described above. Each effect is obtained.
In addition, the machine tool and the machining method of the present invention are more effective particularly when the workpiece 30 is a rolling bearing part. The rolling bearing component referred to here refers to a rolling element, an inner ring, an outer ring, or the like that is a race. The rolling bearing is not particularly limited in the form of the bearing, and can be applied to, for example, the following self-aligning rolling bearing.

FIG. 5 shows an example of a double-row self-aligning roller bearing provided with a spherical roller as a workpiece 30 to be processed by the machine tool 20 and the processing method having any of the above-described configurations. This self-aligning roller bearing 60 has spherical rollers 65 interposed between the raceway surfaces 63 of each row of the inner ring 61 and the spherical raceway surface 64 of the outer ring 62 as a rolling element. . The spherical roller 65 in each row is held by a holder 66 provided for each row.
A spherical roller 65 which is a rolling bearing part in the self-aligning roller bearing 60 is processed as the workpiece 30 shown in FIG. 3 or the like by the machine tool 20 and the processing method having any one of the above-described configurations.

DESCRIPTION OF SYMBOLS 1,1A ... Workpiece rotation jig | tool 2 ... Jig body 3 ... Friction contact member 4 ... Contact member biasing means 5 ... Centerpiece 20 ... Machine tool 21 ... Main shaft 22 ... Core pushing shaft 30 ... Workpiece 31, 32 ... Center hole 51 ... Processing means A ... Workpiece rotating jig set

Claims (13)

Machining into a workpiece supported by the main shaft and the core shaft, a main shaft and a core shaft that support the workpieces between each other, a workpiece rotation jig that transmits rotation between the main shaft and the workpiece, Machine tools equipped with processing means for applying
A jig main body on which the workpiece rotating jig is removably attached coaxially to the tip of the main shaft, and a center piece that is attached to the jig main body and fits into a center hole formed on one end surface of the workpiece. And a plurality of frictional contact members arranged around the axis of the jig body, each of which is supported so as to be movable back and forth in the axial direction, and whose tip surface is a flat contact surface that comes into contact with the end surface of the workpiece, A machine tool comprising a plurality of contact member urging means that are individually provided in the jig main body with respect to each of the friction contact members and urge the friction contact members toward the distal end side.   2. The machine tool according to claim 1, wherein the contact member biasing means of the workpiece rotating jig is a spring.   2. The machine tool according to claim 1, wherein the contact member biasing means of the workpiece rotating jig is a pneumatic cylinder.   The machine tool according to claim 1, wherein the contact member biasing means of the workpiece rotating jig is a hydraulic cylinder.   5. The machine tool according to claim 1, wherein the center piece of the workpiece rotating jig is fixed to the jig body. A main shaft and a core pressing shaft that support the workpieces between each other, a workpiece rotating jig that transmits rotation between the core pressing shaft and the workpiece, and a workpiece supported by the main shaft and the core pressing shaft. Machine tools equipped with processing means for processing
The workpiece rotation jig is fitted into a jig body that is coaxially and detachably attached to the tip of the core pushing shaft, and a center hole that is attached to the jig body and formed in one end surface of the workpiece. A center piece and a plurality of friction contact members arranged around the axis of the jig main body, each of which is supported so as to be movable back and forth in the axial direction, and whose tip surface is a flat contact surface that abuts the end surface of the workpiece. And a plurality of contact member urging means that are individually provided in the jig main body with respect to each of the friction contact members and urge each friction contact member toward the distal end side. The machine tool according to any one of claims 1 to 5, further comprising a workpiece rotation jig that transmits rotation between the core pushing shaft and the workpiece,
A workpiece rotating jig that transmits rotation between the core pushing shaft and the workpiece is attached to the tip of the core pushing shaft so as to be detachable in a coaxial manner, and a workpiece rotating jig attached to the jig main body. A center piece that fits into a center hole formed on one end surface of the workpiece, and is arranged around the axis of the jig body, and is supported so as to be able to advance and retreat in the axial direction, with the tip surface contacting the end surface of the workpiece. A plurality of friction contact members that are flat contact surfaces in contact with each other, and a plurality of contact members that are individually provided in the jig main body with respect to each of the friction contact members and bias each friction contact member toward the tip side. A machine tool comprising an urging means.   The machine tool according to any one of claims 1 to 7, wherein the processing means includes a tool for grinding an outer diameter of a workpiece.   The machine tool according to any one of claims 1 to 7, wherein the processing means includes a tool for grinding an outer diameter of a workpiece.   A machining method for grinding an outer diameter of a workpiece using the machine tool according to claim 8.   A machining method for performing outer diameter turning of a workpiece using the machine tool according to claim 9.   11. The processing method according to claim 10, wherein the workpiece is a roller of a rolling bearing. A processing method of supporting a rolling bearing part by a main spindle and a core pushing shaft of a machine tool and processing the rolling bearing part, forming a center hole on one end face of the rolling bearing part, and fitting a center piece, The rotation of the main shaft is transmitted to the rolling bearing part through the center piece, and a plurality of friction contact members are arranged around the axis of the center hole to bias the friction contact member to the rolling bearing part. A method for processing a rolling bearing part, characterized in that:

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